Devon Energy Corp. said Thursday that it has closed on its $865 million acquisition of RimRock Oil and Gas LP’s leasehold interest and related assets in the Williston Basin.

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The bolt-on deal, announced last month, adds 38,000 contiguous net acres (88% working interest) to Devon’s existing Williston footprint.

Oklahoma City-based Devon said it expects the newly acquired assets to produce an average of 20,000 boe/d over the next year. Moreover, the independent said the transaction adds 100-plus “highly economic” undrilled locations to its inventory.

Before it announced the RimRock acquisition in June, Devon reported average Williston production of 48,000 boe/d in the first quarter and projected turning 15-20 wells to sales in the basin this year.

In a June...